I've never been a fan of the Polk Monitor series, they always sounded a little bit muddy. The higher level Polks are decent. And don't be fooled by the # of drivers. More woofers and tweeters don't mean its a better speaker.

What do you guys think of buying a used Paradigm Monitor series (Titan)? Any advice/thoughts regarding buying used speakers?

The Paradigms are ok....but I would not buy them, and this is coming from a guy who owns a pair of Monitor 7's. I have a pair of Canton 403's stand mount speakers.... I did a shootout with the Monitor 7's and the Cantons walked all over and out performed the more brighter,taller Paradigms. I was totally shocked at what the Cantons did to them. The Cantons had this midrange and higher frequency thing going on that made the music come alive, and placed about 8inches to 1 ft from the back wall the stand mounted Cantons have bass that was much deeper and robust than the Paradigms. The Cantons have a very large sound stage with excellent music dispersion. After listening to the Cantons in the shoot out it totally ruined it for the Paradigms...I mean they became so boring because the Cantons where so musical. I was totally shocked and amazed. You really don't know what you have some times in our gear until you have a shoot out side by side. Ive had both speakers for a while and never had them side by side until this week. Im still laughing my but off. Its like I want to have a shoot out with every one who has speakers now to see if the Cantons can shoot them down.

Tonal matching is important for HT speaker system.....

I was thinking of the overall final product sound you would get. If you mismatch the tones from the various speakers you may wind up not liking the presentation very much. Instead, try to stick with the same speaker line where the tones would match up.

You may want to consider this line as you can put together a system to meet your budget and the tonal quality would be the same across all the speakers.

Ok slight change in plans. Got T55 (found a good deal @ local retailer) and ordered for AVR-1910 (from Expo for $380 shipped). Now I'll wait for a month or 2 to upgrade my center speakers. Now the question I have for you guys is do I have to buy the same series (c40/c60) center speakers or can I get a diff brand/model?